I imagine a lot of vpop artists have their own bodyguards, because if they go out, they are probably swarmed by fans and paparazzi. How much money do you think bodyguards make?
I remember hearing that someone like Lady Gaga pays out over 2 million USD for bodyguards. So I would imagine when a popular vpop star is touring, they are likely spending several 10's of thousands a month. They usually have a team of 5 or more as well.
Hard to say. It depends on what they make, where they travel to, and how well known they are. I would imagine they don't spend as much as other celebrities who are world-famous but I am sure they still spend a lot.